I've been having the same problem. I tried lights off, materials overriden, no physical camera, minimal render size, nothing would work.
Finally I noticed I had the options set to auto save the render on the server path (which is not my machine). This was working before, but I guess if the ip adress changes(or something network related, I'm not an IT expert) vray just doesn't know where to save the file, and produces this kind of bug. No error message, no log entry, nothing besides a black render which is proccessed extremely fast.

I guess this may not be the only cause, but it worked fine with me.
Hope it helps.

Cheers!

Nice Plugin Pierreden!

I see great potential in it, however I can't get it to work.

I see the red outlines perfectly, but when I shift+click in order to "render" the ivy it only constructs the first branch in lines, no faces, no more branches, no leaves, nothing at all.

I don´t know if anyone has had this problem, I skimed through the 250 posts on this thread and didn't see anything similar.

Hope someone can help.

Thanks!